Travel should be a fairly big part of the game in order to establish a semi-controlled market. The beauty with this game is going to be that one player is not the saviour of all man kind who can slay dragons with his pinky, no. It's going to be people doing whatever the hell they want, if people want to make a living transporting goods from one place to another they should be able to do so. If you wish to trade with another player residing in a house 20km to the west, you tell a courier to go there with your goods.
"But what if he decides to steal my goods?!"
Well, that's a risk you're going have to take. Either you could have your courier pay you some form of collateral which he will receive upon return with word from your trading partner that the drop-off was successful.
Put a bounty on his head, tell the players who are roleplaying as police officers to arrest that person upon sight. Go look for him yourself, find him in the woods and stab him down. Let's not turn this ambitious and beautiful game into some shitty generic MMO because whiney bastards make enough noise that they cannot be ignored.
I both hope and wish this game will be as good or better than Ultima Online (t2a).